Daisy chain communication bus and protocol

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(11)

EP 2 823 991 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	11.11.2015 Bulletin 2015/46

(43)	Date of publication A2:
	14.01.2015 Bulletin 2015/03

(21)	Application number: 14176574.3

(22)	Date of filing: 10.07.2014

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International Patent Classification (IPC):

B60L 11/18^(2006.01)
H01M 10/42^(2006.01)

G06F 13/42^(2006.01)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA ME

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Priority:

10.07.2013 US 201313938416

(71)	Applicant: NXP B.V.
	5656 AG Eindhoven (NL)

(72)	Inventors:
	Van Lammeren, Johannes Petrus Maria 6642 BK Beuningen (NL) De Greef, Pierre 5583 GR Waalre (NL) Lammers, Matheus Johannus Gerardus 6031EA Nederweert (NL)

(74)	Representative: EP&C
	P.O. Box 3241 2280 GE Rijswijk 2280 GE Rijswijk (NL)

(54)	Daisy chain communication bus and protocol

(57) A battery pack has first and second battery terminals, plural battery cells each with a battery element, a cell supervisor electrically connected to the battery element, and a communication section to communicate with the cell supervisor. The battery elements are connected serially between the first and second battery terminals. Bus interfaces are arranged in alternating fashion with the battery cells to define a daisy chain bus, each such bus interface being configured for signal communication, the interfaces respectively connecting the communication sections of two adjacent battery cells. A battery manager communicates with the battery cells via the daisy chain bus. The battery manager sends a command message to the battery cells using a through mode protocol, and each battery cell sends at least one of a confirmation message and a service request to the battery manager using a shift mode protocol.

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